package com.itheima.dao.impl;

import com.itheima.dao.BookDao;
//4种实例化方式
//    1。构造方法实例化
public class BookDaoImpl implements BookDao {
    public BookDaoImpl() {
        System.out.println("构造方法实例化.....");
    }

    @Override
    public void save() {
        System.out.println("book dao save 方法在执行 ...");
    }
}
